Ant-associated
Guides
Adranes
ant-loving beetles
Adranes is a genus of obligately myrmecophilous beetles in the rove beetle family Staphylinidae. These small beetles are entirely dependent on ants of the genus Lasius, living as inquilines within their nests. The six described species share extreme morphological adaptations for this lifestyle, including complete eyelessness, reduced mouthparts, and highly modified antennae. They are known from North America, with species distributed across the United States and Pacific coast regions.
Adranes coecus
Adranes coecus is a species of ant-loving beetle in the family Staphylinidae. It is known from eastern North America. The species belongs to the tribe Clavigerini, whose members are obligate myrmecophiles, living in close association with ant colonies.
Adranes taylori
Taylor's Ant-loving Rove Beetle
Adranes taylori is a species of myrmecophilous rove beetle in the tribe Clavigerini, described by Wickham in 1901. Members of this genus are obligate associates of ants, possessing specialized morphological adaptations for life within ant colonies. The species occurs in western North America from British Columbia to California.
Antennophorus
Antennophorus is a genus of mites in the family Antennophoridae. The genus was described by Haller in 1877. At least one species, Antennophorus grandis, is a documented obligate ectoparasite of ants, specifically riding on workers of Lasius flavus and feeding through host manipulation. The genus includes multiple described species, though detailed life history information is available primarily for A. grandis.
Apocephalus frameatus
Apocephalus frameatus is a species of scuttle fly in the family Phoridae, described by Brown in 2002. Like other members of its genus, it is associated with ants as a host, though specific details of its biology remain undocumented. The genus Apocephalus is notable for including species that exhibit brood parasitism of ants, a behavior that has been video-documented in related species but not specifically for A. frameatus.
Aritaerius pallidus
Aritaerius pallidus is a species of clown beetle in the family Histeridae, described by Kovarik and Tishechkin in 2004. It belongs to the subfamily Haeteriinae, a group known for their associations with ants and termites. The species is found in the southwestern United States and Mexico. Like other members of Haeteriinae, it likely exhibits myrmecophilous or termitophilous behavior, though specific biological details remain poorly documented.
Arthmius bulbifer
Arthmius bulbifer is a species of ant-loving beetle in the rove beetle family Staphylinidae, described by Thomas L. Casey in 1893. The species belongs to the subfamily Pselaphinae, a group of small beetles commonly associated with ant colonies. It is known from scattered records across the south-central United States.
Arthmius globicollis
ant-loving beetle
Arthmius globicollis is a species of ant-loving beetle in the family Staphylinidae. It is known from North America, with records from the eastern and central United States. The species belongs to the subfamily Pselaphinae, a diverse group of small rove beetles frequently associated with ant colonies.
Atinus monilicornis
Atinus monilicornis is a species of ant-loving beetle in the family Staphylinidae, subfamily Pselaphinae. It is native to North America and has been documented in nests of the ant Paratrechina faisonensis, indicating a myrmecophilous lifestyle. The species was described by Brendel in 1866. Records span multiple states in the eastern and central United States.
Batrisodes frontalis
Batrisodes frontalis is a species of ant-loving beetle in the family Staphylinidae, first described by LeConte in 1849. It is distributed across northern North America, with records from Canada and the northern United States. Like other members of its genus, it is associated with ant colonies, though specific ecological details remain poorly documented. The species is one of several in the genus Batrisodes found in North America.
Bibloporus bicanalis
Bibloporus bicanalis is a small rove beetle in the subfamily Pselaphinae, characterized by reduced elytra and a compact body form typical of ant-loving beetles. The species was described by Casey in 1884 and occurs in eastern North America. As a member of the tribe Trichonychini, it belongs to a diverse group of myrmecophilous beetles that have evolved specialized associations with ants. Records indicate presence in both Canada and the United States, though detailed biological information remains limited.
Brachiacantha tau
t-marked larkspur lady beetle, T-marked Spurleg
Brachiacantha tau is a small lady beetle (Coccinellidae) measuring approximately 2–3 mm in length. Adults are oval and shiny. The species is notable for its larval biology: larvae feed on scale insects within ant colonies, making them rarely observed. Adults are sometimes found on flowers or hunting in foliage. The specific epithet "tau" refers to a T-shaped marking on the species.
Caccoplectus
Caccoplectus is a genus of myrmecophilous (ant-loving) rove beetles in the family Staphylinidae, subfamily Pselaphinae. The genus was established by Sharp in 1887 and contains approximately nine described species. These beetles are associated with ant colonies, a common ecological strategy among pselaphine beetles. Most species have been described from the Neotropical region, particularly Central America.
myrmecophileant-associatedpselaphinerove-beetleNeotropicalStaphylinidaePselaphinaeArhytodinitropicalant-colony-inhabitantinquilinemicrohabitat-specialistleaf-littersoil-dwellingcrypticrarely-collectedsmall-beetlemorphologically-specialized1887-descriptionSharpCentral-AmericaPanamaColeopteraPolyphagaStaphyliniformiaStaphylinoideaPselaphitaegenus-levelnine-speciesconicusdegallierilucidusnuttingipectinatusschwarzisentisspinipessucineasspine-legged-pselaphidChandlerWoldaSchaeffer190619761986type-species-unknownrarely-observediNaturalist:-2-observationsCatalogue-of-Life-acceptedGBIF-acceptedNCBI-acceptedEukaryotaMetazoaHexapodaInsectaArthropodaAnimaliabeetleinsectarthropodanimalCremastocheilus beameri
Cremastocheilus beameri is a myrmecophilous scarab beetle in the genus Cremastocheilus, commonly known as anteater scarab beetles. The species was described by Cazier in 1940. Two subspecies are recognized: Cremastocheilus beameri beameri and Cremastocheilus beameri pokorny Krajcik, 2014. Like other members of its genus, it is believed to be associated with ant colonies, though specific details of its biology remain poorly documented.
Cremastocheilus crinitus
anteater scarab beetle
Cremastocheilus crinitus is a myrmecophilous scarab beetle known for its specialized parasitic relationship with ants. Adults enter ant colonies by feigning death, allowing scavenging workers to carry them into nests. Once inside, they feed on ant larvae and pupae using modified piercing mouthparts. The species is part of a genus of approximately 35 North American species, commonly called "anteater scarabs" for their predatory behavior toward ant brood.
Cremastocheilus planipes
Cremastocheilus planipes is a myrmecophilous scarab beetle in the genus Cremastocheilus, commonly known as anteater scarabs. These beetles are specialized inhabitants of ant colonies, where they live as predators of ant brood. The species exhibits remarkable morphological and behavioral adaptations for infiltrating and surviving within hostile ant nests. Like other members of its genus, C. planipes is poorly studied and infrequently encountered due to its cryptic lifestyle.
Cremastocheilus quadricollis
Cremastocheilus quadricollis is a myrmecophilous scarab beetle first described by Casey in 1915. As a member of the genus Cremastocheilus, commonly known as anteater scarabs, this species is believed to share the life history traits documented for congeners: living within ant colonies as a predator of ant larvae and pupae. The species has been recorded from Texas in the United States and Durango in Mexico.
Cremastocheilus retractus
Cremastocheilus retractus is a species of anteater scarab beetle in the family Scarabaeidae. Like other members of its genus, this species is myrmecophilous, living within ant colonies where adults feed on ant larvae and pupae. The species occurs in central North America, with records from the United States and Mexico. Two subspecies are recognized: C. r. retractus and C. r. incisus.
Decarthron abnorme
ant eating beetle
Decarthron abnorme is a rove beetle (Staphylinidae) described by J.L. LeConte in 1849. It is known for its association with ants, earning it the common name 'ant eating beetle'. The species has been recorded across much of Canada and the northern and eastern United States. Despite its broad distribution, it remains poorly documented in the literature, with only a single observation in iNaturalist suggesting it is rarely encountered or underreported.
Decarthron longulum
ant-loving beetle
Decarthron longulum is a small rove beetle in the family Staphylinidae, first described by John Lawrence LeConte in 1849. It belongs to a genus commonly referred to as 'ant-loving beetles' due to their association with ant colonies. The species has been documented across eastern North America, from southern Ontario and Quebec through the northeastern and midwestern United States.
Diapriidae
Diapriidae is a family of minute parasitoid wasps in the order Hymenoptera. Adults range from 1–8 mm in length, with most species measuring 2–4 mm. The family contains approximately 2,300 described species in around 150–200 genera, though estimates suggest at least 4,500 species exist globally. Members are primarily parasitoids of Diptera larvae and pupae, with some species attacking Coleoptera or associated with ants. The family exhibits considerable morphological diversity, including frequent winglessness and pronounced sexual dimorphism.
Dinocoryna
Dinocoryna is a genus of rove beetles (family Staphylinidae) in the tribe Lomechusini, subfamily Aleocharinae. The genus was established by Casey in 1893 and contains at least six described species distributed in North America. Members of this genus are myrmecophilous, meaning they are associated with ant colonies.
Ecitonidia
Ecitonidia is a genus of rove beetles (Staphylinidae) established by Wasmann in 1900. The genus belongs to the tribe Lomechusini within the subfamily Aleocharinae. Only one species, E. wheeleri, has been formally described. Members of this genus are myrmecophilous, meaning they live in association with ants.
Ecitoxenidia alabamae
Ecitoxenidia alabamae is a species of rove beetle described by Seevers in 1959. It belongs to the subtribe Myrmedoniina within the tribe Lomechusini, a group known for myrmecophilous (ant-associated) associations. The species is documented from the southeastern United States.
Entedoninae
Entedoninae is a subfamily of chalcid wasps in the family Eulophidae comprising over 90 genera. Members are primarily parasitoids with documented associations across diverse host groups including gall-inducing insects, leafminers, sawflies, thrips, and ants. The subfamily exhibits considerable morphological and ecological diversity, with species found in tropical to temperate habitats worldwide.
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ant-loving beetles
Fustiger is a genus of myrmecophilous (ant-loving) beetles in the family Staphylinidae, belonging to the tribe Clavigerini. These beetles are highly specialized social parasites that live within ant colonies. The genus contains at least three described species: Fustiger fuchsii, Fustiger knausii, and Fustiger stricticornis. Members of this genus exhibit remarkable morphological adaptations for infiltrating ant nests and exploiting colony resources.
Fustiger fuchsii
Fustiger fuchsii is a species of myrmecophilous rove beetle in the family Staphylinidae, subfamily Pselaphinae. It belongs to the tribe Clavigerini, a group of highly specialized beetles that live as social parasites within ant colonies. The species was described by Brendel in 1866. Like other members of its tribe, it has evolved remarkable morphological adaptations for infiltrating ant nests and exploiting colony resources.
Haeterius exiguus
clown beetle
Haeterius exiguus is a small clown beetle in the family Histeridae. It is found in western North America, with records from the western United States and Canada. The species was described by Mann in 1911. Like other members of the genus Haeterius, it is associated with ants, though specific host relationships for this species remain poorly documented.
Hamotus
Hamotus is a genus of ant-loving beetles (myrmecophilous rove beetles) in the family Staphylinidae, subfamily Pselaphinae. The genus contains nine described species distributed primarily in North America. These beetles are associated with ant colonies, though specific ecological relationships remain poorly documented for most species. The genus was established by Aubé in 1844.
Hippeutister californicus
Hippeutister californicus is a species of clown beetle in the family Histeridae, described by Caterino & Tishechkin in 2008. It is native to California and has been documented in association with ant colonies of Solenopsis amblychila, suggesting a myrmecophilous lifestyle. As a member of the subfamily Haeteriinae, it belongs to a group known for specialized relationships with ants.
Laetodon
Laetodon is a genus of hoverflies in the family Syrphidae, subfamily Microdontinae, established by Reemer in 2013. The genus belongs to the tribe Microdontini, a group of hoverflies whose larvae develop within ant nests. Laetodon represents one of several genera within this specialized myrmecophilous lineage.
Losiusa
Losiusa is a genus of rove beetles (Staphylinidae) described by Seevers in 1978. It belongs to the subfamily Aleocharinae, the largest subfamily of rove beetles, within the tribe Oxypodini. The genus is part of the subtribe Dinardina, a group known for myrmecophilous (ant-associated) associations. Species in this genus are small beetles that live in close association with ant colonies.
Lucifotychus testaceus
Lucifotychus testaceus is a minute rove beetle (family Staphylinidae) in the subfamily Pselaphinae, commonly referred to as an ant-loving beetle. It is a myrmecophilous species associated with ant colonies. The species is documented from eastern and midwestern North America, with records spanning Canada and the United States.
Megarafonus
ant-loving beetles
Megarafonus is a genus of ant-loving beetles in the family Staphylinidae, established by Casey in 1897. The genus contains approximately seven described species, distributed primarily in North America. These small rove beetles are myrmecophilous, meaning they live in association with ants. The genus has been subject to taxonomic uncertainty, with ongoing research seeking to clarify its phylogenetic position within the Pselaphinae subfamily.
Megastilicus formicarius
Megastilicus formicarius is a myrmecophilous rove beetle (Staphylinidae: Paederinae) native to North America. It was the sole species in its genus until the 2021 description of M. iowaensis. The species is obligately associated with ants, specifically documented with Formica ulkei colonies. Like other myrmecophilous Paederinae, it likely lives within ant nests, though specific ecological details remain poorly documented. The species is known from museum specimens across northeastern and midwestern North America.
Melba sulcatula
ant-loving beetle
Melba sulcatula is a species of rove beetle in the family Staphylinidae, specifically within the ant-associated subfamily Pselaphinae. It was described by Thomas L. Casey in 1897 and is known from scattered records across the eastern and central United States. The species is classified within the tribe Trichonychini and subtribe Trimiina, a group characterized by small body size and ecological dependence on ant colonies.
Microdon
Ant Flies
Microdon is a genus of hover flies (Syrphidae) in the subfamily Microdontinae, containing approximately 249 species worldwide with greatest diversity in the tropics. The genus is notable for its myrmecophilous lifestyle: adults remain near ant colonies rather than visiting flowers, and larvae develop inside ant nests. Adults are morphologically atypical for hover flies—sedentary, robust, very hairy, and often bee-like in appearance. Larvae are dome-shaped, slug-like, and slow-moving, with spiracles on a peg-like posterior protuberance. The genus has historically served as a catch-all for unrelated species, and ongoing taxonomic revision is expected to reassign many species to other genera.
Microdon cothurnatus
orange-legged ant fly
Microdon cothurnatus, known as the orange-legged ant fly, is a syrphid fly species documented across the Northern United States and Canada. Unlike most hoverflies, adults are rarely observed at flowers. The species is notable for its ant-associated life history: larvae develop within ant nests.
Microdon craigheadii
Large Metallic Ant Fly
Microdon craigheadii is a species of syrphid fly described by Walton in 1912. As a member of the genus Microdon, it belongs to a group known for their unusual life history: the larvae are inquilines in ant nests, living within ant colonies rather than being free-living predators like most hover fly larvae. The species has been documented in North America, with records contributing to understanding of hover fly diversity and distribution patterns. It is one of approximately 6,200 described species of syrphid flies worldwide.
Microdon fulgens
Rainbow Ant Fly
Microdon fulgens is a species of syrphid fly (Syrphidae) in the subfamily Microdontinae. Members of the genus Microdon are commonly known as ant flies due to their unusual life history: larvae develop as inquilines within ant colonies. The specific epithet "fulgens" (Latin for shining or gleaming) likely refers to the adult's appearance. As with other Microdon species, adults are pollinators, while larvae have a highly specialized ecological relationship with ants.
Microdon globosus
Globular Ant Fly
Microdon globosus is a species of syrphid fly in the family Syrphidae, commonly known as the Globular Ant Fly. Like other members of the genus Microdon, it belongs to a distinctive group of hover flies whose larvae develop within ant colonies. The species was first described by Fabricius in 1805 and has been documented in museum collections and citizen science observations, though detailed natural history information remains limited.
Microdon lanceolatus
Spear-horned Ant Fly
Microdon lanceolatus is a species of hover fly in the family Syrphidae, commonly known as the Spear-horned Ant Fly. Like other members of the genus Microdon, it is presumed to have an ant-associated life cycle, with larvae developing within ant colonies. The species was described by Adams in 1903. Very little specific information is documented about this particular species beyond its taxonomic classification.
Microdon manitobensis
Greater Ant Fly
Microdon manitobensis, commonly known as the Greater Ant Fly, is a species of syrphid fly first described by Curran in 1924. It belongs to the subfamily Microdontinae, a group of hover flies with unusual life histories involving ant associations. The species is part of a genus whose larvae are known to inhabit ant nests, though specific details for this species remain limited. It has been documented in museum collections and citizen science observations, with 59 records on iNaturalist as of the available data.
Microdon ruficrus
spiny-shield ant fly
An uncommon syrphid fly of the eastern United States and adjacent Canada. Adults are metallic greenish or bluish black with distinctive cupreous thoracic stripes and a spiny scutellum. Larvae develop within nests of the ant Lasius americanus. The species is one of approximately 6,200 described syrphid flies worldwide.
Microdon tristis
Long-horned Ant Fly
Microdon tristis is a syrphid fly in the subfamily Microdontinae, commonly known as the Long-horned Ant Fly. The species exhibits pronounced sexual dimorphism in wing venation and facial structure. Adults are characterized by distinctive bronze-black coloration with greenish and purplish metallic reflections, and are associated with ant colonies as larvae.
Microdonia
Microdonia is a genus of rove beetles in the family Staphylinidae, established by Casey in 1893. The genus contains at least four described species distributed in North America. Members belong to the tribe Lomechusini within the subfamily Aleocharinae, a group known for myrmecophilous (ant-associated) associations. The genus remains poorly known, with limited ecological and behavioral documentation.
Microdonia laticollis
Microdonia laticollis is a species of rove beetle (family Staphylinidae) in the tribe Lomechusini. Described by Brues in 1902, this species belongs to a genus of myrmecophilous beetles associated with ant colonies. The specific epithet 'laticollis' refers to the broad pronotum characteristic of this species. Like other members of the subtribe Myrmedoniina, it is adapted to life within ant nests.
Mipseltyrus nicolayi
Mipseltyrus nicolayi is a species of ant-loving beetle in the family Staphylinidae, described by Orlando Park in 1953. It belongs to the subfamily Pselaphinae, a group of small rove beetles commonly associated with ant colonies. The species is known from North America, with records from North Carolina and Tennessee.
Mixogaster breviventris
Slender Ant Fly
Mixogaster breviventris is a species of syrphid fly (family Syrphidae) in the subfamily Microdontinae. The species was described by Kahl in 1897. It is known by the common name Slender Ant Fly. As a member of the Microdontinae, it belongs to a group of hoverflies whose larvae are associated with ant colonies.
Myrmechixenus
Myrmechixenus is a genus of darkling beetles in the family Tenebrionidae, subfamily Diaperinae. The genus contains two recognized species: M. lathridioides and M. picinus. Members of this genus are small beetles associated with ant colonies.